Stockholders' Equity and Redeemable Convertible Preferred Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016
Par Value	$ 0.0001	$ 0.0001
Series A Preferred Stock [Member]
Number of Shares Issued and Outstanding
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	N/A
Series C Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.05:1
Series D Preferred Stock [Member]
Number of Shares Issued and Outstanding	4,725	4,725
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.53:1
Series D-1 Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding	834	834
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.53:1
Series F-1 Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.05:1
Series H Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding	381,967	381,967
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.53:1
Series I Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	1.05:1
Series J Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	0.05:1
Series K Convertible Preferred Stock [Member]
Number of Shares Issued and Outstanding	1,240	50
Par Value	$ 0.0001	$ 0.0001
Conversion Ratio	263.16:1